setting up your system

Download and install pd-extended MACOSX package here http://puredata.info/downloads
Download the binary objects of pd_opencv for MACOSX. Unpackit and follow the instructions in the README file.

Device of supported USB cameras in Linuxhttp://www.linux-usb.org/devices.html
Look in the "Multimedia" devices section, the easy is to find a device with a driver which allready is in the main kernel source, but also the others will work.

Any DV1394 device (dv cameras and/or Analog/Digital Converters) works well on Linux